Class: GcodeThumbnailExtractorService

Inherits:
Object
  • Object
show all
Defined in:
app/services/gcode_thumbnail_extractor_service.rb

Instance Method Summary collapse

Constructor Details

#initialize(file:) ⇒ GcodeThumbnailExtractorService

Returns a new instance of GcodeThumbnailExtractorService.



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# File 'app/services/gcode_thumbnail_extractor_service.rb', line 2

def initialize(file:)
  @file = file
  @remaining = nil
end

Instance Method Details

#call ⇒ Object 



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# File 'app/services/gcode_thumbnail_extractor_service.rb', line 7

def call
  data = ""
  while (line = @file.gets("\n"))
    if @remaining.nil?
      if line =~ /thumbnail[^\n]*begin[^\n]*? ([0-9]+)$/
        @remaining = $1.to_i
      end
    elsif line =~ /thumbnail[^\n]*end$/ || @remaining <= 0
      @remaining = nil
      break
    else
      new_data = line.gsub(/^;\s*/, "").chomp
      data += new_data
      @remaining -= new_data.length
    end
  end
  StringIO.new(Base64.strict_decode64(data))
end